[Slad] SLADinstaller Patch: keep certain gtk calls out of thread

[Dirk Jagdmann]

> the attached patch keeps the call of GTK message dialogs
> out of the thread.
> Though it worked before on GNU/Linux,
> on Windows we have problems - the application simply freezes.
> 
> I am not sure whether this is a bug in GTK, in Windows or
> something else.
> 
> However, the solution of the patch should work also for
> GNU/Linux. I haven't tested it yet apart from that it compiles.
> So, please test before creating a new release.

applied, and did a test on linux. It worked.

-- 
Dirk Jagdmann <d.jagdmann at dn-systems.de> : Coder
Tel. +49-5121-28989-15
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